Calling `+ Variable` will raise an `TypeError`.

[Zeroto521]

Describe the bug

Not sure if this is a bug. I can't call + Variable directly.
It behaves differently from +1.

To Reproduce

from pyscipopt import Model

m = Model()
x = m.addVar(name="x", ub=10)
print(+x)
# Traceback (most recent call last):
#   File "/test.py", line 5, in <module>
#     print(+x)
#           ^^
# TypeError: bad operand type for unary +: 'pyscipopt.scip.Variable'

Expected behavior

Calling + Variable should behave like calling Variable.

[Joao-Dionisio]

Sure, we can try fixing this, but what is the benefit?

[Zeroto521]

I don't think this is a bug, but supporting it could reduce errors and feel better.

e = (
    a_long_expression  # This raises a TypeError after this line is commented out
    + another_expression
    + the_last_expression
)

[Joao-Dionisio]

Well, as long as it doesn't inconvenience anyone or cause performance degradation somehow, then I don't see why not.